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v4l2bufferpool: queue back the buffer flagged LAST but empty

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Some decoder drivers need to wait enough capture buffers before
starting to decode. But the dequeued buffer flag LAST but empty
has no chance to queue back to driver, which makes decode hang
after seek. So need to queue back such kind of buffer to driver.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6649>
This commit is contained in:
Hou Qi 2024-04-09 11:29:46 +09:00 committed by GStreamer Marge Bot
parent 1e0cd24d84
commit 5ba2563820
1 changed files with 11 additions and 6 deletions
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17
subprojects/gst-plugins-good/sys/v4l2/gstv4l2bufferpool.c
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@ -1238,6 +1238,7 @@ static GstFlowReturn
gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer,
gboolean * outstanding, gboolean wait)
{
GstBufferPool *bpool = GST_BUFFER_POOL_CAST (pool);
GstFlowReturn res;
GstBuffer *outbuf = NULL;
GstV4l2Object *obj = pool->obj;
@ -1281,12 +1282,6 @@ gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer,
group->buffer.index);
}
if (group->buffer.flags & V4L2_BUF_FLAG_LAST &&
group->planes[0].bytesused == 0) {
GST_DEBUG_OBJECT (pool, "Empty last buffer, signalling eos.");
goto eos;
}
outbuf = pool->buffers[group->buffer.index];
if (outbuf == NULL)
goto no_buffer;
@ -1298,6 +1293,16 @@ gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer,
GST_OBJECT_UNLOCK (pool);
}
if (group->buffer.flags & V4L2_BUF_FLAG_LAST &&
group->planes[0].bytesused == 0) {
GST_DEBUG_OBJECT (pool, "Empty last buffer, signalling eos.");
*buffer = outbuf;
outbuf = NULL;
gst_buffer_ref (*buffer);
gst_v4l2_buffer_pool_complete_release_buffer (bpool, *buffer, FALSE);
goto eos;
}
timestamp = GST_TIMEVAL_TO_TIME (group->buffer.timestamp);
for (i = 0; i < group->n_mem; i++) {